Hi, I've been using Thunderbird for years without a problem. The latest upgrade to version 45.0 broke the check for new messages every xx minutes. That is the only thing that has changed, it happened immediately after the update. I'm running Windows 7 and have two email accounts. They are both IMAP. One is a gmail and one is a local provider. The one that is listed first in the Account settings which is also the gmail account works. The one that is listed second does not work. It never checks for emails. Even if I hit Get Messages, it won't get emails. If I close the program down and restart it. On restart it will check for email once and get the messages correctly. The local provider is Charter. I was on another message board first that I thought was mozilla where other people with Charter are having the same problem. I don't see how this can be a Charter issue when this happened immediately after the upgrade. I haven't change anything about charter for years and have been using TB and Charter for over 10 years. I have my account settings set up like the mobile settings defined in the link for laptop http://www.charter.net/support/internet/adding-new-account-mozilla-thunderbird/ Thanks, Joe